Stocks enter the final week of August coming off one of their rockiest stretches of 2019, the latest example of tariff-induced volatility that has some investors bracing for more fluctuation.

With the S&P 500’s 2.6% drop Friday, the broad equity index brought its average daily swing above 1% for a third consecutive week, the longest such streak of the year, according to Dow Jones Market Data. Stocks averaged a daily move of about 0.5% from mid-June to early August.